Portable drill.



J. A. L. PEALING. PORTABLE DRILL,

I APPLIUATION FILED MAY 12,1910. I 983,083. Patented Jan.31,1911.

' a SHEETS-SHEET 1 J. A. L PBALING.

PORTABLE DRILL. APPLICATION TILED MAY 12, 1910.

Patented Jan.31, 1911.

J. A. L. PEALING.

PORTABLE DRILL.

APPLICATION FILED MAY 12. 1910.

Patented Jan. 31, 1911.

3 SHEET SBHEBT 3.

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UNITED s'rarns PATENT onnron.

,ronn ALFRED nawnnnon TELLING, on SEACOMBE, ENGLAND.

PORTABLE DRILL.

Specification of Letters Batent.

Patented Jan. 31; 1911.

Application filed May 12, 1910. Serial No. 560,957.

To all whom it may concern:

it known that. I, JOHN An oni) LAW- nexcn PEALIDIG, a subjectofthe King of Great Britain, residingat Sea combe, in the county of Chester, in the Kingdom of England, have invented certain new and useful Improvements in Portable Drills, of which the following is a specification.

This inventionrelates to improvements in portable drills for use in drilling holes in metal. for .i1-1sta11ee,sh'ips plates, boilers and the like. of the kind haviugan el'ectro-magnetic holding-bu device and an electric driv.

ing motor .'the magnetic fields of Wlll Cll' are produced by the same set of coils so that the flux due to these coils traverses both the motor and the holding-on magnets.

The invention has for its object to prof ride an lllll'H'OYQtl construction of such a drill 'which shall be simple tornamifacture and shall :t'orm a strong structure and'shall be simple to use and control. i

The invention will be described with reference to the accompanying drawings.

In these drawings;+Figure 1, is an eleva tion of. the complete drill partly" in section on line 1-1, Fig. 2; Fig. 2, a plan View;

i'rrti a l section showing a modified jtorm of :tceding device; Fig. 10, a vertical. section slit-mingthe method of mounting a hand wheel on the drill holder for use when tapping. and Fig. 11, a diagram of the elec trical connections of the apparatus.

The im n'ored drill comprises a pair of holding-on electrtnnagnets a and 5, a drill holder 6 and feed device located between these magnets and an electric motor '7 for rotating the drill arranged at the outer end" of the holding-on magnetl. and driving the drill holder through Worm gearing 7 and 8, the Whole apparatus being so arranged that the same coils 9 and 10 serve for energizing the holding-on magnets and for providing the field of the motor 7, the outer endof the core of the holdingon magnet l fo-rmlng l i one field pole. 11 of the motor, (see Fig. 3), While the other pole 12 is connected to the holdingon magnet 5 through the parts which support the drill holde The core of the magnet 4 is separated, as completely is structurally convenient fromthe surroundingmagnetic parts of the apparatus. This may be effected by removingall magnetic connecting pieces between this core and the rest of the apparatus and supportiiig it inposition by means of nonmagnetic' material, for instance, rings of brass inserted between it and the casing Instead, however, of entirely separating this core, it is in some cases found preferable for C( )1lSl l.-'-l1(ft1()11tllIGHSOIIS t0 leave a tlllll connecting ring between the core and the casing as shown in Figs. 1 and 3. This part may then be so, dimensioned that it very quickly becomes magnetically saturated. To. effectthis, it maybe either perforated with a, number of holes ormac'hined down to a suliiciently small thickness.

In the arrangement shown in the drawings the core of the electromagnet 4 is attached totheadjacent parts by a thin ring 13 which may be perforated at a number of points, and the core is supported from the casingat its otl'icr end by a ring 1& of brass or other nonmagnetic material,

The drill .holder 6 adapted to slide axially in a sleeve 15 and to be fixed at various positions therein by a spring pin 16 engaging in holes Hill the drill holder spindle, the sleeve 15 being also connected with the drill holder by means of a groove and feather 18 and being sunilarly engaged with thevvorm Wheel 8 by means of which it is rotated; The sleeve 15 is provided at its lower end With.an external screw thread which is el'igaged'l'iy an internally threaded collar 19 which. is held between thrust bearlugs 20 and 21 so that it tree to rotate but is held against axial movement. On this collar 19 is mounted a hand Wheel 22. It will be ohviousthat it While the drill is in operation this hand Wheel 22 beeither held stationary or retarded by means of a brake the sleeve 15 Willbe caused to move axially through the collar 19 and so feed forward the tool. The retarding of the Wheel 22' is effected byineans of a brake or equivalent device/ In the preferred form of construe i'lOIltL magnetically operated. retarding device is used. For tl11s purpose a Winding 23 is arranged around'the part in which the drill-feeding sleeve 15 works. This wind ing 23 provides the flux by means of which the brake is operated. In the form of brakesh'own in Figs. 1, 6, 7 and 8 of the drawings' the hand Wheel 22 is formed with acenter part 24 of magnetic mat rial and the greater part of lts rim of non-magnetic material.

An annular cover plate 26 of non-mag- .8, Fig. 6 showing the under side of the hand wheel, Fig. i the upper side with the non-magnetic cover plate 26 (Fig. 1) removed, and Fig. 8 a side view-of the wheel. From Fig. 7 it will be seen that the magnetic central part 24- has two recesses in its periphery at 27 and 28. The rim carrying the pieces may be angularly adjusted relative to the center part so as to vary the reluctance. of the magnetic path to the projections' 25 (which act as pole pieces) by bringing these pieces to lie to a greater or less extent i n front of the recesses 27 and. 28, in the periphery of the part 24. in the position shown the path'has the greatest reluctance to which it can be adjusted. since the recesses are entirely in front oi the parts, 24. 'lhe'adjustnicnt may be fixed by means of a; screw 29 working in a slot 30 in the under part offth-e hand wheel (see Fig. 6).

It. will be obvious that I may if desired use any equivalent fastening device.

The casing which hes outside the coils 23 and forms part of the frame of the apparatus is of iron and may be at one or both sides, as shown at 31 on the left hand I side in Fig. 1, made considerztbly thicken than at the. other parts so that the greater part ofthe return flux is concciitratcd at said thickened part or part .tccordingly as the projections or pole pieces 25 on the hand wheel pass these parts they experience I a pull tending to prevent their forward be seen that as is at to cause movement. It. will thus the sleeve lo'is rotated the wheel frequent intervals retarded so as relative movement bclwccn the sleeve 15 and the collar '19 and give the necessary feed lo the tool. it" will further be seen that the adjustment of the reluctanceot the magnetic path to the pole pieces -25 will vary the strength of the pulls exerted on the hand wheel 22 and acctn'dingly the rate of feed of the tool. An alternative method of producing the feedingforward of the drill {see Fig. 9) is threadedthe drill may beheld.

by forming the hand wheel 22 entirely ofmagnetic material and arranging between this wheel and an end flange 32 of the casing of the winding 23 a ring 33 of magnetic material which is mounted in a groove in thewheel so that there may be relative axial movementbetween it and the parts between which it lies and relative rotary movement between it and the flange 8 while it is caused to rotate with the wheel by means of pins 34 which engage slots or recesses in the ring-33, so that it may be drawn into engagement with flange 32 and serve .as a

continuous friction brake to retard the movement of the wheel.

This pole piece is connected tothe polo llv of the motor and is formed as part of the raising of the motor being in theform shown in Figs. 3. l and .3. separated froin the rurroundlng parts by drilling a nun' bcr oi holes 3(3 so as to leave a comparativelv small amount of magnetic material which ip'iicitly becomes saturated. The same result isob taincd in the form illustrated in Ii. by

cutting away the iron around the pohpiece 35 and mounting this. latter on a plate :1? of brass or other non-magnetic material. The other polefor the blow oulilux is formed by the casing of the swilch which connected to the other pole 12 ot' the motor field.- The switch blade is in the form of a-scmi-circular/picce of metal 38 slit radially at intervals so as to be capable of bearing evenly on thc-vari n1scontactsmounted on the insulzm ing bed 39. "lhese contacts comprisc'a main contact 40 connected with the supply and occupyim a large part of the circle so that the switch member 35% is'always in conta t lhcrcwith. The othe r tacts 51 arc in the form ol' radial strips insulated from each other and arranged so as to occupy the to lnaindcr of the circle (see Fig. l). 'lhc op crating mcmbcrdQ oi the switch extends through "t he casing antl is adapted to be rotated so as to make the successive changes of minim-lion. This rotation is eli'ected by turning" one of the two handles ill by which 'lhese handles arecarried bctwcen parts 43% projecting from the timings of the two holding-on magnets l' and so that by forming one of the handles rotatable and prolonging its spindle beyond i the outer bracket a bevel wheel 4% may be mounted thereon so as to engage with acorresponding Wheel 45 on the switch spindle 42. A notched ring 16 may be provided on the handle spindle (or the switch spindle) adapted to act in conjunction with a spring detent 4-7, the notches being arranged to correspond with the diflerent posilionsot the switch.

To enable the drill to be used for tapping, holes the ordinary feed ma be arranged so as to be thrown out of action and a hand wheel 48 (see Fig. 10) provit'led on the outer end of the drill holder spindle (i. this wheel being loose on the spindle but mounted between collars 49 and 50 so that pressure may' be applied by the operator by this hand wheel to bring the tap into engagement with the hole. The ordinary feed is rcudered inoperative by taking out of action 1 the pin 16 which limits the axial movement of the drill holding spindle t in its sleeve 15. In order to etlect this the pin may be .provided with a projection 51 (see Fig. 1) which engages in a bayonet slot in its support 52 so that on withdrawing the pin and turning it slightly it 'will he held out of action. The winding 23 is preterably disconnected fr'om the source of current at the same time. p

The electrical connections of the apparatus and the manner in which they are controlled by'the' switch are shoivn in Fig, 11. One of the terminals :"nlt'or. the supply is connected as previously mentioned .to the main contact it). To complete the circuit through the various parts of the apparatus the switch member 38 is turned in the direction of the arrow shown in Fig. 11 so as to connect in succession the contacts 41 with the contact 40. The first of these Eontaets 41 is connected with the coils 9 and 10 ot' the.

' holding-on magnets so that the flux through these magnets and through the motor field is established first. Then by means of a second contact ll the armature 54 of the motor is put in circuit and the motor started. Thethird of the contacts 41 completes the circuit through the windin 23 which ac'tuatesthe feed device. It will be seen that by this arrangement of contacts tation of the motor may be chan ed.

Although the apparatus has een above described in considerable detail it will be. understood that such descri 'ition is given forpurposes of illustration rather than with a view to limiting the invention to the spe-' cilic arrangement given.

Itwill be obviousthatconsiderz'tblc alterations may be made Within the scope of the appended claims without departing from the invention.

I declare that what I claim is 1. A portable electric drill comprising a pair of holdin -on electro-i'nagnets, a yoke connecting saic magnets, a motor, the field of which is energized by the holding-on magnets, a sliding sleeve mounted in said yoke, means for rotatingsaid sleeve from said motor, a tool holder mounted in said sleeve and driven thereby, a screw-threaded collar on said sleeve held against axial motion and normally rotating with said sleeve, and means for producing relative, rotary motion between said sleeve and said collar by retarding the movement of said collar and effecting the forward .fecd of the tool thereby.

2. A portable electric drill comprising a pair of "holding-on clec'tro magnets, a yoke connecting said magnets. a motor, the field of which is energized by the holding-on magnote, a sliding sleeve mounted in said yoke, means for rotating said sleeve from said motor, a tool holder mounted in said sleeve. a screw threaded collar on said sleeve held against axial motion, and electro-magnetic means for producing relative motion between said sleeve and said collar and effecting the forward feed of the tool thereby.

3. A portable electric drill comprising a pair of holding-on electro-maguets, a yoke connecting said n'iagnets, a motor, the field of which is energized by the holding-on magnets, a sliding sleeve mounted in said yoke, means for rotating said sleeve from said motor, a tool holder mounted in said sleeve, a screw threaded collar on said sleeve held against axial motion, and elcctro-magnetic means for producing relative motion between said sleeve and said collar and elt'ect-ing the forward feed of the too] thereby, said means comprising a winding located around said sleeve, a wheel on said sleeve. parts on said wheel forming portions of the magnetic circuit for the flux due to said col.

4. A portable electric drillcomprising a pair of holding on electro-magnets, a yoke connecting said magnets, a motor, the field of which is energized by the holding-on magnets, a sliding sleeve mounted in said yoke, means for rotating said sleeve from said motor, a tool holder mounted in said sleeve, a screw threaded collar on said sleeve held against axial motion and electromagnetic meansfor producing relative motion between said sleeve and said collar and tlecting. the forward feed of the tool thereby,

said means comprising a winding located pair of holding-on electro-magnets, a yoke l connecting said magnets. a motor, the field of which is energized by the holding-on;

magnets, a sliding sleeve mounted in said yoke, means for rotating said sleeve from said motor, a tool holder mounted in said Sleeve and driven thereby, a screw threaded collar on said lLtYt held against axial motion, a winding located around said sleeve, a casing of magnetic material around said coil, awheel. on said sleeve, projecting pole pieces on said wheel and a thickened part on the casing of the winding adjacent the path of said pole pieces, whereby a retarding pull i eierted on the pole pieces as they pass this thickened part.

(313i portable electric drill comprising a pair of holding-on electro-magnets, a yoke connecting said magnets. a motor. the field of which is energized by the holding-on magnets. a sliding sleeve mounted in said yoke, means for rotating said sleeve from said motor, a tool holder mounted in said sleeve and driven thereby, a screw-threaded collar on said sleeve held against axial motion, cleetro-magnetic means for producing relative rotar motion between said sleeve and said collar and ett'ccting. the forward feed of the tool thereby, means for putting said last mentioned means out of action and a member mounted on the tool holder so as to be free as regards rotary movement and adapted to be engaged by hand for the purpose of applying pressure to the tool when the appan tus is used for tapping.

T. A portable electric drill. comprising a pair of holding-on electro-n-iagnets, a yoke connecting said magnets, a motorJthe field of which energized by the coils of the holding-on magnets, av tool holder mounted in the yoke, means for oriving said tool holder from saidmotor, means for feeding forward said tool holder, a coil controlling said last mentioned means, a rotary'switch controllingthe electrical connections of the coils and the motor, a circular pole piece attached to one part of the motor field structure and disposed adjacent to the switch, a casing; of magnetic ll'ltl'fellfll surrounding the switch and attached i=. the other part of the motor field structure whereby a blow out flux is caused to pass through the interior of the switch casing.

S. A portable electric drill comprising a pair of holding-on magnets, a yoke connectmg said magnets, a motor, the field of which said motor, means forfeeding forward said tool holder, a coil controlling said last mentinned means, a rotary switch controlling the electrical connections of the coils and the motor, a circular pole piece attached to one part of the motor lield structure and forming the. base on which the switch is mount- 3 ed, a casing of magnetic material surroundl inc" the switch and attached to the other part of the motor field structure, aring of poorl magnetically conducting material between the pole pieces and the casing whereby a blow-out flux is'caused to pass through theinterior of the switch casin S portable electric drill comprising a pair of holding-on electro magnets, a yoke connecting; said magnets, amotor, the field of which is energized by the coils of the holding-on magnets, a tool holder mounted in the yoke. means for driving said tool holder from said motor, means for feeding forward said. tool holder, a coil controlling said last-mentioi'ied means, a rotary switch controlling the electrical connections of the coils and the motor, a circular pole piece attached to one part of the motor field struc ture and disposed adjacent to theswitch,,a easing of magnetic material surrounding the switch and attached to the other part of the motor field structure. whereby ablow-out flu); caused to pass through the interior of the s itch casing, handles for supporting and steadyin' the drill and means for operating: the rota switch from one of said handles.

.10. A portable electric drill comprising a pair of holding-on magnets, a yoke con nccting said magnets, a motor arranged on the. top of one of said magnets the field of said motor being energized by the coils of said magnets. a rotary switch mounted at the side of said motor, a handle attached to the side of said magnet and gearing connecting said handle and said switch.

In witness whereof I have hereunto igned my name this l da of May 1910, in the presence of two subscribing witnesses.

J. A. LfrW'nlcl-NCE PEALING.

lVitnesses:

Rlorro. L. CLEAYER, RWY. lVILLIAMs. 

